I'd like to sneak in a last minute nomination of Milotic under the Defensive Characteristic.
I believe with its great typing, above average speed for a wall, and movepool make Milotic a wall in UU that too hard to overcome. Milotic successfully walls the vast majority of the UU metagame. Haze prevents you from using stat up moves to muscle through it. 81 Speed isn't game shattering but outruns a lot of UU, allowing Milotic to switch in, Recover before you can attack again, and then begin to chip away at the attacker. It may be true that each set has maybe one or two things that can successfully set up or beat Milotic, but it becomes very easy to handle the 1 or 2 Pokemon any one set of Milotic can't beat with 5 other Pokemon. For example, RestTalk, Haze, Surf Milotic may be set up bait for say, Vensaur and Toxicroak, but it becomes very easy to run say, Moltres to counter them, and leave Milotic to wall the rest of the opponents team. I feel Milotic has become the generic answer for many teams for far too many threats. Need an answer to the majority of the metagame's attackers? Slap Milotic on a team.